American Marc Turnesa regained the lead in the Justin Timberlake Shriners Hospitals for Children Open but compatriot Chris DiMarco moved into contention on Saturday. DiMarco carded a round of 63 to leap to 20-under, one behind Turnesa who shot 69 in his third round at TPC Summerlin in Las Vegas. Former Masters champion Zach Johnson, who won the Valero Open last week, is just two off the lead after a round of 70, with Matt Kuchar and Chris Stroud also on 19 under. Mark Hensby remains the best placed Australian in a tie for 21st place, after his four-under par round took him to 14-under overall. Nick Flanagan recovered from his disappointing second round to also post a four-under to take him back up to 10-under, while Jason Day also shot a 68 to be in a tie for 56th. Matthew Goggin is equal with Flanagan in a tie for 36th at 10-under, while Peter Lonard (nine-under) and Matt Jones (eight-under) are languishing at the bottom of the leaderboard. Third Round of The Justin Timberlake Shriners Hospitals For Children Open (Par 72) -21: Marc Turnesa 62 64 69 -20: Chris DiMarco 69 64 63, Michael Allen 63 69 64, Ken Duke 63 66 67 -19: Chris Stroud 65 65 67, Zach Johnson 62 65 70, Matt Kuchar 63 63 71 -18: Brad Adamonis 67 65 66, Ryan Moore 66 64 68, John Mallinger 64 64 70 -17: Brian Davis 65 68 66, Chad Campbell 65 67 67, Chez Reavie 64 66 69 -16: Davis Love III 68 67 65, Jesper Parnevik 69 65 66, Pat Perez 66 63 71 -15: Bill Haas 68 68 65, George McNeil 67 67 67, Kevin Na 64 70 67, Fred Couples 68 64 69 Also: -14: Mark Hensby (Australia) 69 65 68 -11: Jason Day (Australia) 70 67 68 -10: Nick Flanagan (Australia) 64 74 68, Matthew Goggin (Australia) 68 67 71 -9: Tim Wilkinson (New Zealand) 72 65 70, Peter Lonard (Australia) 66 69 72 -8: Matt Jones (Australia) 66 71 71